15.71% is the change from 840 to 972
Calculation steps:
[( 972 - 840 ) ÷ 840] x 100 = 15.71%
Formula
Percentage change = [(972 - 840) / 840] x 100
Subtract the new number by the original number
972 - 840 = 132
132 ÷ 840 = 0.15714285714285714
0.15714285714285714 x 100 = 15.71%